Hi sorry your having problems purchasing. I tried this with a different credit card. I’m not sure what is wrong with the square system but this will work.
Choose your tickets, Click add to cart, then view cart, then proceed to checkout, click pay with paypal ( it says you can use any card ), Accept terms, click place order, then it will take you to a PayPal screen ( at the bottom it has a spot that says pay with debt or credit card ) click that, fill in the required fields, you do not have to join PayPal to finish the order but it will give you the option. Finish order.
Sorry for the added steps I hope to fix square soon. Thank you for your patience.